Copper Coil

Copper is considered to be the most highly-rated thermal and electrical conductor compared to other metals. Thus, using copper coils are the central source of energy for larger machine infrastructures and in product designs. These coils are extremely efficient and reliable. The outstanding benefits that copper coils provide includes the following:

● Lightweight

● Strong

● High thermal conductivity

● Long-lasting

● Requires little to no maintenance

● Anti-microbial

● Corrosion resistant

● Easily formed into a shape

● Reusable and recyclable 

Most condenser and evaporator coils used today are made of copper tubes and aluminum fins, but some manufacturers have started to use aluminum for both their coils' tubes and fins. There is currently a big debate in the HVAC industry about the pros and cons of aluminum tube vs copper coils.

Copper is the preferred metal for coil tubes due to its superior conductivity, strength, and durability. Looking at how the HVAC/R coil manufacturing process works, the price of copper has risen significantly over recent years, causing more and more manufacturers to start producing coils without the material. When compared to copper, aluminum is extremely affordable, even though it transfers two times less heat than copper.

Winner: Copper has a higher heat transfer coefficient than aluminum. This makes copper a better choice for transferring excess heat in the coils to avoid overheating and malfunctioning of air conditioning units and refrigerators. Overall helping to prevent heat loss.

Winner: Formicary corrosion and galvanic corrosion are common issues for coils made of copper tubes and aluminum fins. Although they can be prevented by proper maintenance, protective coatings, cleaning on a regular basis; and when they do happen, they are easy to repair.

Winner: When a copper-tubed coil is damaged in the field, it's easy and economical to repair, and it almost never requires an entire hvac coil change, that is not the case with aluminum-tubed coils.

If an aluminum tube gets damaged the repair would involve special materials, take a long time, and contractors are usually unable to perform it on site.

Winner: Copper's tensile strength is approximately 40% higher than that of aluminum. Copper also has a lower thermal expansion coefficient. What that all means is that copper will get damaged or break less often than aluminum. Due to the fragility of aluminum its difficulty to repair, many air conditioner manufacturers include a heavy-duty cabinet to protect the aluminum-tubed coils, making cleaning the coils a very difficult task, which lowers their durability. 

Copper is a great choice of metal to use for many different projects especially when electricity is involved. Copper can conduct electricity better among any other metals out there making it predominantly found in the engineering, heating, refrigeration, cooling electrical and heat exchanging application industries. Different shapes and sizes of copper can be cut out of large sheets of it and can be formed into rods, plates, pipes, sheets, coils and many more based on use and application.

Copper coil is copper that is made up to include multiple turns. When all rolled up and sitting down, it can look similar to a toy slinky or even a hose depending on the diameter of the coil.

Because it is made out of copper is serves as an electromagnetic coil that will act as a conductor. Copper coils can be found in the back of a refrigerator, in a space heater or any kind of heating system. They are also used and play a role in running big industrial machines and equipment.

Craft fairs and art shows are pretty popular for many people to attend these days. Copper coil is used to create many art pieces and it gives them a unique look. Whether a piece is made completely out of copper coil, or just a few elements are highlighted by using it, it ads flare. Many women who make homemade jewelry are using copper as well as a part of their designs.

Copper can get quite shinny and flashy just as other jewelry can look. Jewelry made out of this is not as common as your basic silver and gold pieces. Its color is unique and different from other pieces and it can be bent and formed into whatever creation one wants. 

Capillary fittings are fittings that have a socket-type end which could help to close the tolerance gap between copper coil and the connecting fittings. When both copper coil and capillary fittings are cleaned and fluxed, they can form a small even gap between them upon assembly. As a result, when the solder is heated until it melts, the forces of adhesion and cohesion will cause the melted solder to flow into the capillary gap and a strong and watertight joint can be formed.

The method of making capillary joints involves the following steps:

Measure and cut the copper coil to the length needed and make sure it is cut neither too short nor too long so that a proper joint can be achieved.

The coil and capillary fittings need to be cleaned by using sand paper or steel wool. Once cleaned, a sufficient flux will be applied resulting in a thin coat on the mating surfaces. This is to prevent dust and dirt from contaminating the capillary gap. Once the copper coil and capillary fittings are fluxed, the joint is ready for heating.

Heat the joint and the solder should melt when it is brought into contact with the coil. Continue the heating process if the solder does not melt. The capillary gap should be filled with sufficient solder all around the coil.

Be aware that any excessive solder will lead to a bead formed at the bottom of the joint or there is a chance that it will run inside the coil along the system. There is a small hint on the length of solder needed for soldering on small tube diameters. A length of solder which approximately equals to the diameter of the tube should be enough to fill the joint.

After the soldering is done and the joint has been made, allow them to be cooled down so the solder can solidify without any disturbance.

Lastly, wipe the outer surface of the tube with a cloth to remove any excess of flux on it. 

When looking at the advantages of copper, it's obvious to see that copper makes an ideal material for heat transfer coils – especially because of its efficiency, its corrosion resistance and its recyclability. After all, it is because of these advantages that copper tubing has been used in heating, cooling and plumbing solutions for generations, and why it's still used today in various applications, including water source heat pump (WSHP) systems for a wide variety of buildings around the world.
 

Better thermal efficiency results in footprint and operational advantages
Copper offers nearly 7x higher thermal conductivity than steel. This better conductivity enables equipment sizing and efficiency benefits, allowing for same or better efficiency in a smaller footprint. More efficiency usually leads to less input power required and, because lower coil volumes are typical, operators can see reduced cost and volume of glycol required for freeze protection in applicable climates.
In addition to footprint and input power advantages, units with copper coils usually weigh significantly less, which can reduce crane installation costs and simplify building structure analysis for retrofits. Less weight and smaller footprint can often lead to faster installation times, which can save operators/contractors additional costs, too.
 

Corrosion resistance offers longer service life
In chemical terms, copper is defined as a "noble metal" based on its resistance to oxidation, or corrosion. This corrosion resistance is another reason why copper offers a distinct advantage over galvanized or carbon steel coils. Copper coils stand up better to occasional draining or other air introduction than hdg steel coils – which are often bare carbon steel on the inside and can rust in the presence of air – and can extend equipment life and simplify maintenance.
 

High salvage value, long service life make copper a more-sustainable material
Aside from its long service life, copper is a more sustainable metal because it can be recycled easier – and for a higher salvage value – than many other materials, making it beneficial to both the owner and the environment. Typical salvage values of copper are more than 30x the typical scrap values for steel on a per pound basis. It is also considered to be "100% recyclable" . 

Guilin Lijia Metals Co., Ltd, established in 1976, is a key enterprise of copper fabrication in Guangxi, China. Our enterprise, as a key exporting enterprise in Guangxi, is the council member of China Nonferrous Metals Association. We are located in Tieshan Industrial Park of Guilin High and New Technology Industrial Development District.
Our company is a modern nonferrous-metals processing enterprise engaging in manufacturing copper and copper alloy (brass, copper-nickel and bronze) tubes/pipes/coils, rods/bars, profiles and finned tubes. Persevering in development orientation of "special, innovation, shaped and preciseness", we have accumulated more than 40 years' manufacturing experience and held yearly capability of 16,000 tons.
Insisting on global business strategy and worldwide marketing net, we started exporting business since 1998 and have steady market in USA, Europe, Australia, Canada and Southeast Asia.
Our corporate culture slogans are "teamwork, perseverance, preciseness, sincerity and innovation".
Registered capital of Guilin Lijia reaches 187 million. Our shareholders include Guangxi Hanggui Industrial Co., Ltd (52.52%), China Orient Assets Management Co., Ltd (34%) and Guilin National Asset Investment Management Company (13.48%). 

Guilin Lijia has a professional management system, which is certified by ISO 9001: 2015, ISO 14001: 2015 and OHSAS 18001: 2007.
Our quality assurance system is certified by TUV SUD Industrie Service GmbH in accordance with the Pressure Equipment Directive 2014/68/EU, Annex I, Section 4.3, AD 2000-Merkblatt W 0 as well as EN764-5, Para. 4.2.
Besides, we also get Certificate of Works Approval authorized by China Classification Society.
Our Intellectual Property Management System is in accordance with GB/T 29490-2013.